Acho que você está encontrando um bug com o IE 6 e o SP 1 retirados de aqui
(7) SSL / Do not save encrypted pages to disk
- Category: Solution
- Difficulty: Easy
- From: Greg
- Added: September 06, 2005
- Updated: September 06, 2005
Version: Windows - any / IE - any
If View Source is turned off for https URLs, it may be because of a security setting. >Look in Tools > Internet Options > Advanced tab > Security section, and look for the >option Do not save encrypted pages to disk. When checked off, this option will >intentionally disable View Source.
And to confuse the issue, according to Microsoft KB article 811102 "Do Not Save >Encrypted Pages to Disk" was not working properly in Internet Explorer 6 SP1, causing it >to leave View Source enabled even when the option was checked. This problem was corrected >in a hotfix. From the KB article: After you install this hotfix, if you load SSL-secured content while you have selected >the Do not save encrypted page to disk option, the Source menu is not available.